
<html>


<style>

*{

	margin:0;
	padding:0;
}

div {
margin-top:40px;
margin-left:40px;
box-sizing: border-box;
line-height:54px;
}

span {
	width:0;
	height:0;
	overflow:hidden;
	font-size:0;
	border:27px solid transparent;
	border-top-color:#2DCB70;
	/* border-bottom-color:#2DCB70;
	border-left-color:#000;
	border-right-color:blue; */
    /* top就是倒三角，bottom就是上三角，left,right类似 */
}
</style>

<body>

<div>

<span></span>

</div>
</body>


